At lengths up to 16 feet long, the high-efficiency VTH venturi heater coil has been added to the VS Series air curtains. The series is designed for environmental separation at internal and exterior industrial doorways, aiding in the prevention of energy losses and infiltration of fumes, flying insects, and airborne particulates, while improving occupant air comfort and safety. The VSA and VSB Models have been extended to span from a previous 12-foot-length capacity to now 13-16 feet long. The 16-gauge aluminized steel, single-construction units are structurally robust and need only end supports. According to the manufacturer, it extended the lengths to 16-foot spans as modular units constructed of shorter, bolted-together lengths cause inherent airflow gaps between sections and require labor-intensive intermediate mounting supports that potentially obstruct roll-up door mechanisms. The VS Series’ single construction design of the blowers and discharge nozzles allow for an even volume, velocity, and uniform (VVU) airflow across the entire air curtain length. The elimination of intermediate supports also reduces installation time by at least 10 percent. The thermally protected VTH design, which ranges 14-70-kW and 44,000-238,000-Btuh capacities, is
positioned outside the airstream in the fan assembly, so it doesn’t im-pede airflow.